diff --git a/common/src/jni/main/cpp/conscrypt/jniutil.cc b/common/src/jni/main/cpp/conscrypt/jniutil.cc
index 7f106a9ce..96385df2a 100644
--- a/common/src/jni/main/cpp/conscrypt/jniutil.cc
+++ b/common/src/jni/main/cpp/conscrypt/jniutil.cc
@@ -159,14 +159,15 @@ void jniRegisterNativeMethods(JNIEnv* env, const char* className, const JNINativ
     ScopedLocalRef<jclass> c(env, env->FindClass(className));
     if (c.get() == nullptr) {
         char* msg;
-        (void)asprintf(&msg, "Native registration unable to find class '%s'; aborting...",
-                       className);
+        CONSCRYPT_UNUSED int n = asprintf(
+                &msg, "Native registration unable to find class '%s'; aborting...", className);
         env->FatalError(msg);
     }
 
     if (env->RegisterNatives(c.get(), gMethods, numMethods) < 0) {
         char* msg;
-        (void)asprintf(&msg, "RegisterNatives failed for '%s'; aborting...", className);
+        CONSCRYPT_UNUSED int n =
+                asprintf(&msg, "RegisterNatives failed for '%s'; aborting...", className);
         env->FatalError(msg);
     }
 }
diff --git a/common/src/jni/main/cpp/conscrypt/native_crypto.cc b/common/src/jni/main/cpp/conscrypt/native_crypto.cc
index ab1f1512a..965b80150 100644
--- a/common/src/jni/main/cpp/conscrypt/native_crypto.cc
+++ b/common/src/jni/main/cpp/conscrypt/native_crypto.cc
@@ -7835,7 +7835,7 @@ static int sslSelect(JNIEnv* env, int type, jobject fdObject, AppData* appData,
         if (fds[1].revents & POLLIN) {
             char token;
             do {
-                (void)read(appData->fdsEmergency[0], &token, 1);
+                CONSCRYPT_UNUSED int n = read(appData->fdsEmergency[0], &token, 1);
             } while (errno == EINTR);
         }
     }
@@ -7866,7 +7866,7 @@ static void sslNotify(AppData* appData) {
     char token = '*';
     do {
         errno = 0;
-        (void)write(appData->fdsEmergency[1], &token, 1);
+        CONSCRYPT_UNUSED int n = write(appData->fdsEmergency[1], &token, 1);
     } while (errno == EINTR);
     errno = errnoBackup;
 #endif